After the Bible was completed (that which is perfect was come) ...
1 Corinthians 13:10
But when that which is perfect is come, then that which is in part shall be done away.
there was no longer a need for miracles to prove preachers were of God. Everyone could read the Bible or access the Bible for themselves to confirm the word of God.
I don't know where this idea has come from but it is wrong. It's a verse ripped from it's context.
A completed canon is not remotely hinted at as the perfection to come.
The perfection to come is after resurrection when we see God face to face. As is explained in the same passage of scripture.
1 Corinthians 13
8 Love never fails; but if
there are gifts of prophecy, they will be done away with; if
there are tongues, they will cease; if
there is knowledge, it will be done away with. 9 For we know in part and prophesy in part;
11 When I was a child, I used to speak like a child, think like a child, reason like a child; when I became a man, I did away with childish things.
12 For
now we see in a mirror dimly,
but then face to face; now I know in part, but
then I will know fully, just as I also have been fully known